Because if Discord starts having major issues that impact convenience, I'll have an easy time pointing that out to my friends-- particularly if there's an open source alternative that alleviates said issues.

Signal was pretty rough when it first came out but the moment they had support for Windows, OS X, iOS and Android, it was ridiculously easy to convince people to make the switch from whatever they were previously using to Signal.

I feel like you're too concerned with playing devil's advocate than trying to figure this out for yourself by thinking in more nuanced terms.